http://chetroy.com/healthyvegan/?p=225

The Best Homemade Dishwasher Detergent
kathy homemade products 2008-11-08

I have been using my recipe for dishwasher detergent for about 6 months. 
Sometimes my dishes had a dull film on them (as report on other sites). To fix 
this, I used Seventh Generation dishwasher detergent once per week. It seemed 
to keep things under control, but I wanted to create a formula that worked all 
on its own. I read about using citric acid and finally ordered some from 
Mountain Rose. The citric acid was THE ANSWER!! After using my new and improved 
dishwasher formula one time, the inside of my dishwasher was white and clean. 
And my dishes were sparkling!! I have been using it all week with excellent 
results – no film, only squeaky clean dishes. I am very excited!!

    * 1  cups borax
    * 3/4 cup baking soda
    * 3 tablespoons citric acid
    * 2 1/2 tablespoons of ground castile bar soap

Pour borax, baking soda, and citric acid into a glass jar. Shake to mix. Add 
soap and shake to mix again. Use about 2 TB per load.

I have soft water. I have read other recipes that call for about 1/4 cup salt, 
which may help for hard water areas.

Notes about soap: I use a food processor shredder attachment to shred Dr. 
Bronner’s bar soap (any flavor) and then I use the regular food processor 
blade to mince it into a powder.

**Update 2/16/09: I have been using this recipe now for over 3 months, and it 
still works extremely well, better than other natrual detergents that I have 
purchased. It seems to work best when fresh so I reduced the size of the recipe 
(changes are shown above).